package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.sky.constant.MessageConstant;
import com.sky.dto.UserLoginDTO;
import com.sky.entity.User;
import com.sky.exception.LoginFailedException;
import com.sky.mapper.UserMapper;
import com.sky.properties.WeChatProperties;
import com.sky.service.UserService;
import com.sky.utils.HttpClientUtil;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
public class UserServiceImpl extends ServiceImpl<UserMapper , User> implements UserService {
    //微信接口服务请求地址
    public static final String WX_LOGIN_URL = "https://api.weixin.qq.com/sns/jscode2session";
    //授权类型
    public static final String GRANT_TYPE = "authorization_code";

    @Autowired
    private WeChatProperties weChatProperties;
    @Autowired
    private UserMapper userMapper;

    /**
     * 微信用户登录
     * @param userLoginDTO
     * @return
     */
    @Override
    public User login(UserLoginDTO userLoginDTO) {
        //通过请求微信接口服务获取openid
        String openid = getOpenid(userLoginDTO.getCode());

        //判断openid是否为空
        if (openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        //检查该用户是否为新用户，若是则实现自动注册
        User user = userMapper.getByOpenid(openid);
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .createTime(LocalDateTime.now())
                    .build();

            userMapper.insert(user);
        }
        //返回数据
        return user;
    }

    /**
     * 获取openid
     * @param code
     * @return
     */
    private String getOpenid(String code){
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code", code);
        map.put("grant_type", GRANT_TYPE);
        String json = HttpClientUtil.doGet(WX_LOGIN_URL, map);

        JSONObject jsonObject = JSONObject.parseObject(json);

        return jsonObject.getString("openid");
    }
}
